How to clean a glass canyon...

You can walk under the middle of Standard Life House in Edinburgh and when you come from back to front, there's this wonderful twin tower followed by glass canyon that separates the east from the west side of the building.

We often see the window cleaner bods hooking themselves to the outside of the building and cleaning the harder to reach windows of which there are many, but today was the first time I saw them using the cranes to give the glass canyon a wee polish.